ydb/library/cpp/actors/core/monotonic.h

#pragma once

#include <util/datetime/base.h>

namespace NActors {

    /**
     * Returns current monotonic time in microseconds
     */
    ui64 GetMonotonicMicroSeconds();

    /**
     * Similar to TInstant, but measuring monotonic time
     */
    class TMonotonic : public TTimeBase<TMonotonic> {
        using TBase = TTimeBase<TMonotonic>;

    private:
        constexpr explicit TMonotonic(TValue value) noexcept
            : TBase(value)
        { }

    public:
        constexpr TMonotonic() noexcept {
        }

        static constexpr TMonotonic FromValue(TValue value) noexcept {
            return TMonotonic(value);
        }

        static inline TMonotonic Now() {
            return TMonotonic::MicroSeconds(GetMonotonicMicroSeconds());
        }

        using TBase::Days;
        using TBase::Hours;
        using TBase::MicroSeconds;
        using TBase::MilliSeconds;
        using TBase::Minutes;
        using TBase::Seconds;

        static constexpr TMonotonic Max() noexcept {
            return TMonotonic(::Max<ui64>());
        }

        static constexpr TMonotonic Zero() noexcept {
            return TMonotonic();
        }

        static constexpr TMonotonic MicroSeconds(ui64 us) noexcept {
            return TMonotonic(TInstant::MicroSeconds(us).GetValue());
        }

        static constexpr TMonotonic MilliSeconds(ui64 ms) noexcept {
            return TMonotonic(TInstant::MilliSeconds(ms).GetValue());
        }

        static constexpr TMonotonic Seconds(ui64 s) noexcept {
            return TMonotonic(TInstant::Seconds(s).GetValue());
        }

        static constexpr TMonotonic Minutes(ui64 m) noexcept {
            return TMonotonic(TInstant::Minutes(m).GetValue());
        }

        static constexpr TMonotonic Hours(ui64 h) noexcept {
            return TMonotonic(TInstant::Hours(h).GetValue());
        }

        static constexpr TMonotonic Days(ui64 d) noexcept {
            return TMonotonic(TInstant::Days(d).GetValue());
        }

        template<class T>
        inline TMonotonic& operator+=(const T& t) noexcept {
            return (*this = (*this + t));
        }

        template<class T>
        inline TMonotonic& operator-=(const T& t) noexcept {
            return (*this = (*this - t));
        }
    };
} // namespace NActors

Y_DECLARE_PODTYPE(NActors::TMonotonic);

template<>
struct THash<NActors::TMonotonic> {
    size_t operator()(const NActors::TMonotonic& key) const {
        return THash<NActors::TMonotonic::TValue>()(key.GetValue());
    }
};

namespace NActors {

    constexpr TDuration operator-(const TMonotonic& l, const TMonotonic& r) {
        return TInstant::FromValue(l.GetValue()) - TInstant::FromValue(r.GetValue());
    }

    constexpr TMonotonic operator+(const TMonotonic& l, const TDuration& r) {
        TInstant result = TInstant::FromValue(l.GetValue()) + r;
        return TMonotonic::FromValue(result.GetValue());
    }

    constexpr TMonotonic operator-(const TMonotonic& l, const TDuration& r) {
        TInstant result = TInstant::FromValue(l.GetValue()) - r;
        return TMonotonic::FromValue(result.GetValue());
    }

} // namespace NActors